Fix Flutter profile_unopt and release_unopt builds

runtime/vm/source_report.cc

Index: runtime/vm/source_report.cc
diff --git a/runtime/vm/source_report.cc b/runtime/vm/source_report.cc
index 390c0f5471074bbd899ecc3a1e06f2b3a6bbd8cc..e156203e50365609070416d5463e0c294dbc5bec 100644
--- a/runtime/vm/source_report.cc
+++ b/runtime/vm/source_report.cc
@@ -1,7 +1,7 @@
 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-
+#ifndef PRODUCT
 #include "vm/source_report.h"
 
 #include "vm/compiler.h"
@@ -533,3 +533,4 @@ void SourceReport::PrintJSON(JSONStream* js,
 }
 
 }  // namespace dart
+#endif  // PRODUCT